[Elecraft] RTTY FILter

[wa9fvp]

My K3 defaults to FL3 which is the stock 2.7/5 filter.  There is a 400 Hz
filter in FL2 but when it's selected, the phase distortion kicks in just a
little.   You have to under the concept of the Butterfly filter.  Both mark
and space filters are coherent filters and phase distortion in the roofing
filters can effect the butterfly if it's too narrow.  FL3 (2.7/5) is
selected but as I dial down the width control, the DSP narrows the 15KHz IF. 
The DSP filter isn't a problem when AFSK is selected.  It's the dual filter
that's the problem.

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Jack WA9FVP
Willco Electronics
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